Rent a PEX cutter and crimper (or borrow one if you know someone who might have ever dealt with plumbing), cut the old line, get a new tap and a new ring and crimp it on.
Take these pics to the plumbing department at Rona or Home Depot and one of the experts can talk you through it showing you the tools and parts you need. It's not much more than a 5 minute job.
Cutter works as in this video:
Crimper works as in this video:
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